From c00018cadfbf07b95d10b0e152c4edd7d5d19779 Mon Sep 17 00:00:00 2001
From: Maxim Kochetkov <fido_max@inbox.ru>
Date: Thu, 4 May 2023 10:16:17 +0300
Subject: [PATCH] ASoC: dwc: add optional reset support

Some SoC may have resets for I2S subsystem. So add optional reset support.

Signed-off-by: Maxim Kochetkov <fido_max@inbox.ru
Link: https://lore.kernel.org/r/20230504071618.52012-1-fido_max@inbox.ru
Signed-off-by: Mark Brown <broonie@kernel.org
---
 sound/soc/dwc/dwc-i2s.c | 27 +++++++++++++++++++++------
 sound/soc/dwc/local.h   |  1 +
 2 files changed, 22 insertions(+), 6 deletions(-)

diff --git a/sound/soc/dwc/dwc-i2s.c b/sound/soc/dwc/dwc-i2s.c
index acdf98b..e2b2ba0 100644
--- a/sound/soc/dwc/dwc-i2s.c
+++ b/sound/soc/dwc/dwc-i2s.c
@@ -17,6 +17,7 @@
 #include <linux/io.h>
 #include <linux/interrupt.h>
 #include <linux/module.h>
+#include <linux/reset.h>
 #include <linux/slab.h>
 #include <linux/pm_runtime.h>
 #include <sound/designware_i2s.h>
@@ -648,6 +649,14 @@ static int dw_i2s_probe(struct platform_device *pdev)
 	if (IS_ERR(dev->i2s_base))
 		return PTR_ERR(dev->i2s_base);
 
+	dev->reset = devm_reset_control_array_get_optional_shared(&pdev->dev);
+	if (IS_ERR(dev->reset))
+		return PTR_ERR(dev->reset);
+
+	ret = reset_control_deassert(dev->reset);
+	if (ret)
+		return ret;
+
 	dev->dev = &pdev->dev;
 
 	irq = platform_get_irq_optional(pdev, 0);
@@ -656,7 +665,7 @@ static int dw_i2s_probe(struct platform_device *pdev)
 				pdev->name, dev);
 		if (ret < 0) {
 			dev_err(&pdev->dev, "failed to request irq\n");
-			return ret;
+			goto err_assert_reset;
 		}
 	}
 
@@ -676,24 +685,27 @@ static int dw_i2s_probe(struct platform_device *pdev)
 		ret = dw_configure_dai_by_dt(dev, dw_i2s_dai, res);
 	}
 	if (ret < 0)
-		return ret;
+		goto err_assert_reset;
 
 	if (dev->capability & DW_I2S_MASTER) {
 		if (pdata) {
 			dev->i2s_clk_cfg = pdata->i2s_clk_cfg;
 			if (!dev->i2s_clk_cfg) {
 				dev_err(&pdev->dev, "no clock configure method\n");
-				return -ENODEV;
+				ret = -ENODEV;
+				goto err_assert_reset;
 			}
 		}
 		dev->clk = devm_clk_get(&pdev->dev, clk_id);
 
-		if (IS_ERR(dev->clk))
-			return PTR_ERR(dev->clk);
+		if (IS_ERR(dev->clk)) {
+			ret = PTR_ERR(dev->clk);
+			goto err_assert_reset;
+		}
 
 		ret = clk_prepare_enable(dev->clk);
 		if (ret < 0)
-			return ret;
+			goto err_assert_reset;
 	}
 
 	dev_set_drvdata(&pdev->dev, dev);
@@ -727,6 +739,8 @@ static int dw_i2s_probe(struct platform_device *pdev)
 err_clk_disable:
 	if (dev->capability & DW_I2S_MASTER)
 		clk_disable_unprepare(dev->clk);
+err_assert_reset:
+	reset_control_assert(dev->reset);
 	return ret;
 }
 
@@ -737,6 +751,7 @@ static void dw_i2s_remove(struct platform_device *pdev)
 	if (dev->capability & DW_I2S_MASTER)
 		clk_disable_unprepare(dev->clk);
 
+	reset_control_assert(dev->reset);
 	pm_runtime_disable(&pdev->dev);
 }
 
diff --git a/sound/soc/dwc/local.h b/sound/soc/dwc/local.h
index 1c361eb..d64bd4f 100644
--- a/sound/soc/dwc/local.h
+++ b/sound/soc/dwc/local.h
@@ -89,6 +89,7 @@ union dw_i2s_snd_dma_data {
 struct dw_i2s_dev {
 	void __iomem *i2s_base;
 	struct clk *clk;
+	struct reset_control *reset;
 	int active;
 	unsigned int capability;
 	unsigned int quirks;
-- 
2.7.4